Now it's time to let the zip sludge to dry/set. It will get much lighter as it dries. After drying it's time to look for places where insufficient water was used and add some more water to them. To keep the spray fine enough there will be no mud splatters I used an airbrush loaded with distilled water (the water from my well has minerals in, it tastes great but I use distilled water the thin paint or add to plaster to prevent any unwanted chemical side effects from occuring).

Main staging, side A is below this area so I used a roll of paper attached to the dark blue tape mud dam at the edge of the layout to keep dibbles and splatters of the tracks below. I of course moved all rolling stock out of this area and covered the tracks with paper before starting.